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图1、illustration of a uniform bragg grating.here neff1 and neff2 are the effective indicesof the low and high index sections, respectively, is the grating period, and r and t are thegrating’s reflection and. Mode sources are used to inject light into the simulation either from the optical fibre (a) or from the waveguide (b).

News_5 Oct 13, 2025

波长选择，常用的应该是grating。他的原理是这样的，一个周期性的grating在一束光打在上面的时候，会发生反射以及折射。反射情况下： n1k sin（theta in）+ qk= n1 ksin（theta out）这里的q是整. 图3、mask layout for a focusing grating coupler. 图1、2d fdtd simulation configuration for the grating coupler, including the optical fibre.